How do I get rid of thorny weeds in my garden?

katy asked:

We put cow manure on our garden 3 yrs ago. Since then we have had these redlike thorny weeds in our garden. I have hoed and cut them out and disposed of them in the burn barrel to eliminate the seeding but they still come back. What can I do that is organic to rid the garden of them?
Please organic not chemicals.
Please organic not chemicals.

Green Lifestyle

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